Device for turnable windows

ABSTRACT

A device for turnable windows including a frame having a first side face and a second side face, each of the side faces of the frame including a longitudinal groove; a casement having a first edge side face and a second edge side face, the casement being pivotally mounted within the frame by pivots positioned at mid-points of the casement and a link-arm mechanism extending between a respective pivot and the frame, each of the first edge side face and the second edge side face including a first guide bushing and a second guide bushing. The first and second guide bushings of each of the edge side faces travel in a respective one of the grooves. A rotatable lever simultaneously extends or retracts one of the pair of first guide bushings or the pair of second guide bushings into or out of engagement with their respective grooves.

This application is a national stage filing under 35 U.S.C. § 371 ofInternational Application No. PCT/SE98/01775 filed on Oct. 2, 1998.

TECHNICAL FIELD

The invention concerns an improved window, the casement of which ismounted on pivots in its associated frame.

BACKGROUND OF THE INVENTION

Double glazing and well as triple glazing windows have been developedlately in which the window panes are treated to prevent strong heatradiation from penetrating the glazing. Instead, part of the heatradiation is reflected back into the atmosphere. In this manner it hasbecome possible to prevent powerful sunlight from heating the premisesin a building excessively during the summer, with resulting economy offor instance the energy required to operate an air conditioning system.In many cases it has also become possible to do without Venetian blinds.

However, as summer progresses into autumn and winter, the conditions arethe opposite ones. During this period it is desirable to prevent thermalenergy in the heated premises from radiating through the windows andinto the atmosphere.

From the Swedish Patent Specification No. 505 297 is known a device bymeans of which a casement may be pivoted from a closed position withrespect to a frame, over half a turn into a reversed, closed position,and to lock the casement in said closed position. Following its release,the casement may be pivoted from the closed position, either further inthe same direction or backwards in the opposite direction. In thismanner the device offers the user a choice of which side of the windowhe wishes should be directed outwards and which to be turned inwardsduring a certain period.

In order to lock the casement in the closed position thereof the frameis fitted with a locking mechanism comprising a rotatable member and acatch, the latter being movable into and out of a casement securingposition adjacent a stationary guide bushing mounted on the windowframe. To this end, the frame must be formed with a transverse groovewhich is open towards the atmosphere and which runs into alongitudinally extending groove designed to guide the guide bushing, toensure that the latter travels towards the locking mechanism uponclosing of the casement and outwards, into the open air upon pivotalmovement outwards of the casement.

SUMMARY OF THE INVENTION

The object of the subject invention is to simplify the constructiondefined above. This object is achieved by the provision of a rotatablelever mounted in the casement or the frame and by means of which guidebushings may be extended or retracted simultaneously in pairs out ofrespectively into said grooves. This arrangement obviates the need for aseparate catch, and the longitudinal grooves no longer need terminate ina transverse groove. Yet, the same possibilities as before areavailable, in that when the casement has been pivoted over half a turnin the reverse direction and closed and locked in said reversed positionby retraction of one of the pairs of guide bushings, the casement may bepivoted in the reverse direction, or its pivotal movement in the samedirection as originally may be continued by retraction of the oppositepair of bushings.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in closer detail in the following withreference to the accompanying drawings, wherein

FIG. 1 is a plan view of the casement and the frame of a window,

FIG. 2 is a schematic representation of the frame and its associatedcasement, wherein the latter is shown in various pivotal positions, and

FIGS. 3 and 4 illustrate on an enlarged scale and in two differentpositions a guide-bushing pair and a link-arm mechanism interconnectingsaid bushings and being associated with a rotatable member or lever.

DETAILED DESCRIPTION OF THE INVENTION

The window to be described in the following comprises a casement 1,which is mounted on pivots in a frame 2 by means of a link-arm mechanismof a construction known per se. This link-arm mechanism consists of alink arm 3, one end of which is pivotally mounted on a pivot 4 in thewindow casement 1 whereas its opposite end is provided with a bushing 5travelling in a groove 6 formed in the frame 2. A second link arm 7 ispivotally mounted in the frame 2 at one of its ends while its oppositeend is hingedly connected to the link arm 3 at a point somewhatinteriorly of the pivot 4 on the casement 1. Guide bushings 8 a and 8 b,one at each corner of the casement 1, travel in a groove 9 extending inparallel with groove 6 in the frame 2.

FIGS. 3 and 4 illustrate a locking mechanism, like-wise of aconstruction known per se, which in the conventional manner is builtinto the casement 1. This locking mechanism consists of two pivotallyinter-connected links 10 and 11. A rotatable member or lever 12 may beremovably connected to the first-mentioned link 10, see FIG. 1. Linkarms 13 and 14, respectively, and displacement rods 15 and 16,respectively, connect the links 10, 11 with one of guide bushings 8 a or8 b.

With the aid of the rotatable lever 12 the guide bushings 8 a, 8 b maybe displaced from the position illustrated in FIG. 3 in which thecasement 1 may be pivoted outwards while two of the guide bushings, 8 aor 8 b, slidably move inside their associated one of grooves 9, to theposition illustrated in FIG. 4 in which the casement 1, once it occupiesits closed position, may be locked in response to the two remainingguide bushings 8 a or 8 b entering into the grooves 9 in the frame 2 oneither side of the casement 1.

Because of the removable mounting of the rotatable lever 12 it becomespossible, from the initial position illustrated in FIG. 1, wherein bothpairs of guide bushings 8 a and 8 b assume the locking position, to openthe window as desired by pivoting the upper or the lower portion of thecasement 1 outwards merely by shifting the rotatable lever from onelink-arm mechanism to the other.

The invention is not limited to the features illustrated and describedherein but may be varied in many ways within the scope of the appendedclaims. Obviously, the device in accordance with the invention may bearranged in such a way that the window may be pivoted eitherhorizontally or vertically. In addition, the rotatable mechanism 12 maybe located in the frame 2 rather than in the casement 1 and, in responseto its rotary movement, actuate force-transfer means which are removablyconnected with the locking mechanism 10, 11 and 13 to 16.

What is claimed is:
 1. A device for turnable windows comprising: a framehaving a first side face and a second side face, each of said side facesof said frame including a longitudinal groove; a casement having a firstedge side face and a second edge side face, said casement beingpivotally mounted within said frame by pivots positioned at mid-pointsof the casement and a link-arm mechanism extending between a respectivesaid pivot and the frame, each of said first edge side face and saidsecond edge side face including a first selectively retractable guidebushing and a second selectively retractable guide bushing, said firstand second guide bushings of each said edge side face traveling in arespective one of said longitudinal grooves, and a rotatable lever whichsimultaneously extends or retracts one of said pair of first guidebushings and said pair of second guide bushings into or out ofengagement with said respective longitudinal grooves; wherein saidcasement obtains an ajar position in said frame when one of said pair offirst guide bushings and said pair of second guide bushings engage saidrespective longitudinal grooves; and wherein said casement may bepivoted from the ajar position in a reverse direction over half a turnand be closed in a reversed position by retraction of said one of saidpair of first guide bushings and said pair of second guide bushings andthen extension thereof into engagement with said respective longitudinalgrooves.
 2. The device of claim 1 wherein, from said closed reversedposition, said casement may be pivoted in an opposite direction byfurther retraction of said one of said pair of first guide bushings andsaid pair of second guide bushings out of engagement with saidrespective grooves.
 3. The device of claim 1 wherein, from said closedreversed position, said casement may continue to be pivoted in thereverse direction by retraction of the other one of said pair of firstguide bushings and said pair of second guide bushings out of engagementwith said respective grooves.